WHIMSY

An Arduino-based data-logger for meteorological data including: air pressure/altitude, gas, humidity, temperature, wind direction, wind speed. Data is collected with a specified interval, starting from the moment the device is powered and saving the measurements to a csv file on a SD card.

Parts

• Arduino nano
• SEN 08942 wind adenometer sensor¹
• SEN 08942 wind specometer sensor¹
• BME 280 or 680 weather sensor²
• SD card reader
• SD card (up to 2GB FAT16)
• 10k resistor
• microUSB-USB connector

Schematic

pinout

Check your controller's spec which pins have ADC or interrupt capabilities!

• SD reader (GND, MISO, SC, MOSI, CS, 5V, 3V, GND | GND, D12, D13, D11, D10, 5V, NA, GND)
• BME680 (SD, GND, SCK, SDI, VCC, CS | NA, GND, A5, A4, 5V, NA)
• spedometer (1, 2, 3, 4 | GND, NA, NA, D3)
• anemometer (1, 4 | A2, GND)

Output

• Temperature (*C)
• Pressure (hPa)
• Humidity(%)
• Gas (kOhms)
• Approximate altitude(m)
• Wind speed (m/s)
• Wind direction (tertiary intercardinal directions³)

Specifications:

• Communication protocol: SPI
• Libraries: math, Wire, SD, SPI, LowPower, Adafruit_Sensor and Adafruit_BME680
• Battery-life: 1 week on a 20.000mAh powerbank; 0.019A/h

Footnotes

1. Argent datasystems; Weather Sensor Assembly p/n 80422; https://www.argentdata.com/catalog/product_info.php?products_id=145 ↩ ↩²

2. Adafruit board using Bosch BME 260 or 680 gass sensor; https://www.bosch-sensortec.com/products/environmental-sensors/humidity-sensors-bme280/ or https://www.bosch-sensortec.com/products/environmental-sensors/gas-sensors/bme680/; ↩

3. "N", "NNE", "NE"... ↩